Hello Daniel. I'm Greg, here to help you with this.
Try the fixes which work most often for the MS Store app here:
https://answers.microsoft.com/en-us/windows/for...
If none of those work then Go over Windows 11 with this Performance Checklist to try to find and fix problems:
https://answers.microsoft.com/en-us/windows/for...
FFeel free to ask back any questions. Based on the detailed results you post back, I will have other suggestions if necessary.
______________________________________________
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.